I travel to the US 2-3 times a year and I want to use my iPhone while traveling. The first task is to understand is your usage.  My typical usage is:

• Voice Calls – I receive 2-3 calls daily with a total daily talk time of 20 mins, generally I know 2 of the 3 calls I get daily
• Text Messages – I receive about 10 a day, and send 5
• Data Usage – I use about 50 MB a day, more if I’m tethered

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